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• <br />C) Flow Net Analysis for Eastern Backfill Area <br />Average Discharge Rate, Q <br />Average Hydraulic Gradient, I <br />Width of Eastern Backfill Area, W <br />Average Saturated Thickness, H <br />Average Cross-sectional Area, A, <br />perpendicular to flow (W x H) <br />Average Permeability, R given by <br />R = Q <br />IA <br />- 0.45 <br />0.08 x 400,000 <br />= 1.4 x 10 5 ft/sec <br />= 200gpm <br />= 0.45 ofs <br />= 0.08 <br />= 8000 £t <br />= 50 ft <br />= 400,000 ft <br />D) Annual Recharge to Western Backfill Area (when fully reclaim- <br />ed) <br />Area of Western Backfill = 8.5 x 10~ ft <br />Estimated Annual Recharge Rate = 0.25 ft/year <br />Total Recharge = (8.5 x 10~ ft ) (0.25 ft/yr) <br />= 2. 1 x 10 ~ ft /yr <br />= 300gpm <br />• <br />• <br />